import { createStore } from 'redux'

const counter = (state = 0, action) => {
    switch (action.type) {
        case 'INCREMENT':
            return state + 1
        case 'DECREMENT':
            return state - 1

        default:
            return state
    }
}

let store = createStore(counter)

store.subscribe(() => console.log(store.getState()))